Augustus allgoevek



(No Model.)v

4A. ALLGOBVBR.

DRILL STOCK.

No. 383,031. Patented May 15, 1888 lllllI-llllllllllllll N: PETERS. Phutmulhggnphnr. Wammkn, D4 O.

NITED STATES PATET rricla AUGUSTUS ALLGOEVER, OF NEW' YORK, N. Y.

DRILLBSTOCK.

SPECIFICATION forming part of Letters Patent No. 383,031, dated May 15, 1888.

Application filed Octobfr 21, 1987. Serial No. 252,975.

To @ZZ whom, t may concern.:

Be it known that l, AUeUsrUs ALLeonvnR, of the city, county, and State of New York, have invented certain new and useful Improve ments in Stocks for Hand-Drills, Hand-Lathes, Polishing-Tools, and other Tools; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification, in which- Figure l is an elevation of my improved stock for hand-drills and other tools; Fig. 2, a central longitudinal section of the same, the nut being shown as on the upward stroke. Fig. 3 is a transverse section in line .r m, and Fig. 4 a transverse section in lineg/y of Fig. 2.

My invention relates to that class of stocks for drills and other tools in which the drill or tool is operated by the reciprocating movement of the nut upon a spirally-threaded rotating spindle carrying the same.

It has for its object to simplify the construction of such a stock and to render its operation more effective.

It consists in the combination, with the spindle of a hand-drill or other revolving handtool provided at one end with a suitable socket for receiving the tool, of a iy-wheel mounted upon the opposite end of the spindle and coupled thereto by a frictional connection, a sleeve having spiral grooves or threads formed externally along the length thereof, and which is fitted upon the spindle to have a slight longitudinal play thereon, and to engage the socketpiece of the spindle by means ofa coneclutch, and a loose nut moving upon the sleeve,whereby when the nut is held fast to prevent its rotation and is pushed forward toward the socket it will produce an engagement of the sleeve with the socket by means of the interposed cone-clutch, and operating to turn the sleeve will thereby turn the socket, tool-spindle, and tool; but when the nut is lifted or pushed in the opposite direction it will disengage the clutch, leaving the spindle and tool to continue their rotation independently ofthe sleeve, while the nut is carried back to the opposite end in readiness to be again pushed forward.

In the accompanying drawings, A represents a drill-spindle, and B a socket secured (No model.)

to its lower end to receive and holda drill, C, in any approved manner.

D, Fig. 2, is a fly-wheel divided circumferentially into two halves adapted to be united by transverse screws e, and W hich is centrally perforated to receive the upper end of the spindle A, to which itis secured by means of a transverse pin, f, (or ofa disk or plate asits 'equivalent,) fixed in or upon the spindle to enter and fit closely within a circular recess, g, formed in the opposite faces of the two di visions of the flywheel to encircle the central other by means of the revolution of the pinv in its inclosing recess.

The iiy-wheel D, thus fitted upon the upperend of the drill-spindle A, is inclosed within a suitable shell or handle, H, also formed in two circumferential divisions, c c. The lower division, c', terminates in a collar, d, to embrace the spindle, and a loose sleeve, a, is interposed upon the spindle between the collar d and the liy-wheel, its upper end serving as a bearing for the fly-wheel. The upper division, c, of the shell or handle II is rnade to screw into a seat in the rim of the lower division, c', and is fitted centrally with a screw plug, J, which screws into a central aperture in the top of the shell. This screw-plug is formed with a central recess, i, to receive the upper end of the spindleA and forni a pivoted bearing therefor.

The upper end ofthe drill-socket B1 is made conical or tapering in form, and a counterpart conical cap, M, is Iitted loosely upon the other end of the sleeve to fit upon said socket and engage the same with a frictional bearing, the opposed tapering surfaces constituting a clutch. A long tube or sleeve, N, is likewise tted over the drill-spindle A and attached to IOO the cap M, to extend thence to the collar d of the handle H. A washer, O, is interposed between the upper end of the sleeve N and the collar d, and a slight longitudinal play is permitted to the sleeve, whereby the opposed conical surfaces of the socket B and cap M, fixed to the sleeve, may be brought into close frictional contact and engagement, so that a revolution of .the sleeve shall produce a rotation of the spindle, or may be separated to allow the latter to turn independently of the former. (See Fig. 2.) The sleeve N is formed or fitted with external spiral grooves, m m,and intervening threads, n n, along its length, and a nut, P, is fitted to slide freelylongitudinally upon the sleeve, this nut being formed with an internal cylindrical aperture to embrace t-he threads of the sleevc,and with internal offsets, r r, midway :its length, to tit into the grooves of the spiral, whereby the movement of the nut longitudinally upon the sleeve in either direction will produce, if the nut be prevented from turning, a revolution of the sleeve about its longitudinal axis.

The pitch of the spiral grooves m mis made to increase gradually toward the lower end of the sleeve, as shown in Fig. 1, so that as the nut P is carried from the top to the bottom of the sleeve at a uniform speed the speed of rotation will be made to gradually increase during the entire movement.

In the operation of the device, if the nut P be pushed toward the upper end of the sleeve, it will operate to lift the sleeve Nso as to disengage the cap M from the socket B, and the sleeve will revolve upon the spindle A independently thereof. If,now,the nut P be held in the hand so that it may not turn, and be forced toward the socket B, the engagement of the internal offsets, r 1', with the spiral grooves m m of the sleeve will rst force the cap M of the sleeve into engagement with the sockethcad B of the spindle, and will then cause the sleeve and spindle to rotate with an free to continue their rotation while the nut is carried to its first position. The momentum of the fly-Wheel D, carried within the shell or handle H upon the upper end of the spindle, will operate eii'ectually to continue the rotary movement of the spindle as the nut is being elevated. In case the spindle is accidentally caught and held it is protected from too great a strain thereon by reason of the momentum of the iiy-wheel by the pin f, or equivalent disk, confined in the circular recess g between the two divisions of the ily-wheel, which allows an independent movement of the l wheel in case of such a strain.

I claim as my invention#u 1. The combination of the spindle,the shell or handle fitted upon one end thereof and furnishinga pivotal bearing for said end,a socketpiece secured upon the opposite end of the spindle, an interposed spirallygrooved sleeve encircling the spindle loosely and having a limited longitudinal play thereon between the socket-piece and handle, a nut fitted upon the sleeve to engage its spiral grooves,and a clutch formed between the proximate ends of the sleeve and socket-piece, substantially in the manner and for the purpose herein set forth.

2. The combination of the spindle, the divided tly-wheel, a pin fixed radially in the spindle to project therefrom into a circular recess between the. divisions of the fly-wheel, and screws whereby the divisions are clamped upon the pin, substantially in the manner and for the purpose herein set forth. v

3. The combination of the drill-spindle,the y-wheel attached to the end thereof, and a shell or handleinclosing the iiy-wheel and furnishing an end bearing for the spindle, substantially in the manner and for the purpose herein set forth.

In testimony whereof I have signed my name to this specification in the presence of two subu scrbing witnesses.

AUGUSTUS ALLGOEVEB.

Witnesses:

A. N. JEsBERA, E. M. WATSON. 

